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When working with Next.js and some other JavaScript projects, where a process needs to be started on a given port, sometimes, after closing the terminal with the process, the closing terminal doesn't actually 

So what happens, as a result, is when  you run a start command targeting the same port, the launch fails with an error similar to this:

Before continuing, make sure that you have actually closed all terminal windows/tabs that may be running an instance of a project on that port.

If you have, and still are facing this error, the fix is simple and consists of two commands:

This command lists all the processes running on port 

. I ran it and i had multiple processes on it, and you may have too. For me the below was the output:

So from the above output we would take the 

Note that if you have multiple processes running, you will likely need to pick the one with the command 

 (unless, of course, you know what you are doing and are going for something else, in which case, you would pick the PID that suits your target).

Hope this helps, now go start that process! 🚀👨🏻‍🏭

30-second solution to the error "Port 3003 is already in use."

How to fix Port 3000 is already in use macOS

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